Retrieving an particular element from JSONArray

Question

How can I retrieve "B2" from the following? JSONArray?

        JSONArray o = new JSONArray();
    for(int i = 0; i < 3; i++) {
        List<Object> list = new ArrayList<Object>();
        list.add("B" + i);
        list.add(100+i);
        o.put(list);
    }

I'm thinking it's something like the following, although this isn't at all correct.

o.get(2)[0]

No, it would be o.getInt(2). See json.org/javadoc/org/json/JSONArray.html#getInt%28int%29 — Lukas Knuth
– Lukas Knuth, Commented Mar 5, 2013 at 23:43

Lukas Knuth · Accepted Answer · 2013-03-05 23:53:46Z

1

The problem is that you're using put(), which:

Put a value in the JSONArray, where the value will be a JSONArray which is produced from a Collection.

So, this will add an array into your array. Something like this:

[
  [
    "B1", "B2"
  ]
]

If this was intended, then you'll first need to get the inner array and then it's second entry:

o.getJSONArray(0).getInt(1);

Otherwise, if you want to fill your existing JSONArray o with the entries from the List, you'll want to use the JSONArray(Collection)-constructor.

answered Mar 5, 2013 at 23:53

Lukas Knuth

25.8k16 gold badges88 silver badges114 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Vito Gentile · Accepted Answer · 2013-12-17 08:53:26Z

0

You've created an array of bidimensional arrays. The following code snippet should work:

o.getJSONArray(2).getString(0);

edited Dec 17, 2013 at 8:53

answered Mar 5, 2013 at 23:57

Vito Gentile

14.6k11 gold badges65 silver badges99 bronze badges

Collectives™ on Stack Overflow

Retrieving an particular element from JSONArray

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related